Basic Concepts of Chemistry
Fast practice, instant feedback. Timer auto-submits when time’s up.
Avg score: 100% Most missed: “Concentrated aqueous sulphuric acid is %98H2 SO4 by mass and has a density of 1.…”
Basic Concepts of Chemistry
Time left 00:00
1 Questions

1. Boron has two stable isotopes - 10B (19%) and11B (81%)Average atomic weight for boron inthe periodic table is [1990]